Palette window
（重定向自Floating palette）
The graphical control element palette window, also known as utility window or floating palette, floats on top of all regular windows and offers ready access tools, commands or information for the current application.
Applications use palette windows to prevent toolbar clutter. While toolbars and ribbons are typically horizontal, locked to window or screen borders, and of fixed length; palettes are usually scaled to fit their contents, movable, and vertical, consuming less of a computer's commonly landscape oriented screen space, and work better with multiple monitors.